From Longman Dictionary of Contemporary Englishhorror-struckˈhorror-ˌstruck (also horror-stricken) adjective SHOCKFRIGHTENEDsuddenly very shocked and frightened
Examples from the Corpus
horror-struck• He glanced swiftly around and was horror-struck.• The governor's white-gloved hand froze in mid-flourish and for a second he stared horror-struck at the chattering animal.• Time froze and events unrolled before Meredith's horror-struck gaze as if in a slow-motion and silent film. 